Add detection for more distinct exceptions based on api codes.

[todo]

dispike/dispike/errors/network.py

Lines 2 to 7 in 7757642

	# TODO: Add detection for more distinct exceptions based on api codes.
	def __init__(self, status_code, request_text):
	self.message = f"Discord API returned an unexpected response back [{status_code}]: {request_text}"
	def __str__(self):
	return self.message

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This issue was generated by todo based on a TODO comment in 7757642 when #5 was merged. cc @ms7m.